MAINT: Update ndarray-parallel itertools dev-dep to 0.7.0

Author: bluss

parallel/Cargo.toml

@@ -18,4 +18,4 @@ ndarray = { version = "0.10.0", path = "../" }
 
 [dev-dependencies]
 num_cpus = "1.2"
-itertools = "0.6"
+itertools = { version = "0.7.0", default-features = false }